The 55 Gigaton Challenge | TED Countdown

The 55 Gigaton Challenge | TED Countdown
Transcript
Transcriber: Leslie Gauthier Reviewer: The air we breathe has changed. The mix of gases is shifting, with more and more greenhouse gases like carbon dioxide. And this shift is happening faster each year. In fact, concentrations of CO2 have reached levels never before breathed by humans, since Homo sapiens evolved. In just a few hundred years, eons... Read More
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